Last post on Nov 18, 2013 at 12:56 PM
You are in the Chevrolet Metro/Geo Metro
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Chevrolet Metro, Geo Metro, Fuel System, Convertible
#156 of 411 Surging idle between 2 and 3000
Apr 15, 2009 (7:19 pm)
I just got a 2000 Chev. Metro, 3 cyl. I limped home with it from the auction. The air filter bracket was reversed. Compression is 120 lb. It has a surging idle from 2 to 3000. Mechanic said to try replacing the idle motor, but it's still the same after I put in one from the junk yard. I sprayed carb cleaner to check for leaks. EGR valve is free and holding a vacuum. Car has 153,000, seems ok otherwise. It shows no engine codes.
#157 of 411 Re: Surging idle between 2 and 3000 [bluebirdlake]
Apr 15, 2009 (7:32 pm)
a vacuem test would tell if you had multable burnt valves; it could be!! one because it has low compression; Metro 3 cyl engines are knowen for this! Are they all within 15% of each outher, over the total avrager?
#158 of 411 Re: Surging idle between 2 and 3000 [zenden]
Apr 15, 2009 (11:03 pm)
Compression test was close to 120 on all three. I guess I'm still thinking of old VW's where that would be good compression.
#159 of 411 Re: Surging idle between 2 and 3000 [bluebirdlake]
Apr 16, 2009 (6:08 am)
I checked the specs. on your 2000 Metro 3 cyl Normal Compression : 199 PSI, minimum 156 PSI
#160 of 411 93 metro 90 engine
May 07, 2009 (1:32 pm)
I am buying a 93 the engine is bad so I purchased a 90 model engine I see some different sensors on both can I drop it in or do I need to swap everything?????
#161 of 411 89 metro 5th grear struggle
May 12, 2009 (5:08 pm)
I recently purchased an 89 metro and it pretty much runs fine except when I try to travel in 5th gear. As soon as I reach the appropriate speed for 5th gear and try to put it in it seems to bog and starts to decelerate as if it's almost to high a gear, but I can't maintain speed or accelerate. I can leave it in 4th and climb up to 65 no problem. Could this be because of an EGR or PCV clog that effects the amount of load the car can push at 55pmh in that gear, or fuel filter?
#162 of 411 Re: 1989 geo metro LSI fast idle [zenden]
May 12, 2009 (5:18 pm)
Hello, I saw your response and you seemed like you knew a thing or two about those metro's. I have an 89 and all seems to run fine except when traveling in 5th gear. I can run the car up to 65-70 in 4th no problem but when I try to shift to 5th it almost acts like it bogs and starts to decelerate, not maintaining speed or accelerating at all. What do you think the problem could be?
#163 of 411 Re: 1989 geo metro LSI fast idle [mageo]
May 12, 2009 (8:20 pm)
It could be low vacume due to a clogged catalytic converter but then it would have a loss of power through the whole power range. How long has it been doing this? How long have you had it do you know the car; or GEO's and how they feel?; and is this problem getting worse? Is it possible that the tires are to tall for that car are they 12 inch tires on the car? Is it possible that it has the FXI trans in it, that would throw the speedo off and be making you go faster then what it shows; in turn putting an extra strain on the eng,
It could be the fuel filter or pump; or the pump pressure regulator, it is under the air breather on top of the throttle body toward the front passengers side. it is round with about 3 screws. If the fuel pressure is low when under a load due to the regulater, you could replace for about $40. parts, or clean it out with spray cleaner; watch out most likely its spring loaded and a small ball check valve seated. Make sure that you seal it properly. If it where a fuel supply problem witch it sounds like it could be, then most likely when you are on the highway pulling a hill as it has that loss of power slows down if you where to put it to the floor and hold it then immediately down shift and hold it to the floor again , this would be the extreme test for the fuel supply system. The car will then fall flat on its face, chug and maybe even come to a stop due to lack of fuel pressure, or low fuel flow when needed; unless you where to let off of the gas to let the pressure build back up.
If it where a cat clog, then it could be tested with a vacuum gage at idle; and if it where a cat clog then there would be a primary reason for the clog, like low eng temp as in bad thermostat( running to cold, low ignition timing; is many times the reason for the cat clog! all of this would be a symptom of bad MPG for a long time to clog it. Its hard to fix a car online so sorry for thinking out loud! but hopefully it is what you needed to give you some ideas that will help. Most people on here will try to fix there own or get pointed in the general direction, then speak to other mechanics about it. Ask away I will do my best when I can to help.
#164 of 411 Re: 89 metro 5th grear struggle [mageo]
May 17, 2009 (8:33 pm)
I've never heard of the fuel pressure regulator on a Metro giving trouble. And the PCV valve and EGR valve would have a much greater effect on running at low speeds and in the lower gears than they would in 5th at high speed.
I believe it is one of 5 possibilities: poor compression, excessive resistance in the plug wires, defective distributor cap or rotor, clogged fuel filter, or worn or unsuitable spark plugs.
The compression pressure in the 3 cylinder Metro should be 195psi. If it is lower than 180psi in any cylinder; the engine cannot be made to perform properly.
The spark plug wires should have no more than 1,000 ohms resistance for each inch of wire length. (They measure 500 ohms per inch of length when new.)
The distributor cap can create problems if the carbon button in the center of the inside edge is missing or damaged. There also can be problems if the inside surface of the cap has any carbon tracks or lines on it; or if it is coated with dirt on either the inside or outside. It must be kept surgically clean. The same goes for the rotor.
The fuel filter should be replaced, as it is the least commonly maintained item on that car; and is thus the most likely to need replacement. And it will have the greatest effect on running in 5th gear.
Metro engines are astonishingly sensitive to spark plug brand and condition. Most people install NGK plugs in that engine; just because they are such a popular brand. But in the 17 years I have owned my 1990 Metro, and in the 30 plus years that I have been a diagnostic, fuel and electrical systems specialist; I have never seen a worse spark plug choice for the Metro than NGK plugs!!! In this car, I would recommend either Bosch # 7900 Super Plus (which is a fairly new part number, and may be difficult to locate), or Champion # 332 (RN7YC). The gap in these plugs should be set to .043". These plugs are slightly colder than the recommended ones; and my experience is that they work better, for that reason.
#165 of 411 Re: 89 metro 5th grear struggle [zaken1]
May 17, 2009 (9:27 pm)
What you said sounds like good advice! As for the PCV and EGR comment that I made, that was in refrance to anouther post; Not this (5th grear struggle post). He could also check the resistance on the ignition coil.